// 导出页面为PDF格式
import html2Canvas from "html2canvas";
import JsPDF from "jspdf";
export default {
  install(Vue, options) {
    console.log("opttions", options);
    Vue.prototype.getPdf = function (title) {
      html2Canvas(document.querySelector("#exportPdf"), {
        allowTaint: true
      }).then((canvas) => {
        const contentWidth = canvas.width;
        const contentHeight = canvas.height;
        const pageHeight = (contentWidth / 592.28) * 841.89;
        let leftHeight = contentHeight;
        let position = 20;
        const imgWidth = 595.28 - 40;
        const imgHeight = (592.28 / contentWidth) * contentHeight - 0;
        const pageData = canvas.toDataURL("image/jpeg", 1.0);
        const PDF = new JsPDF("", "pt", "a4");
        if (leftHeight < pageHeight) {
          PDF.addImage(pageData, "JPEG", 20, 20, imgWidth, imgHeight);
        } else {
          while (leftHeight > 0) {
            PDF.addImage(pageData, "JPEG", 20, position, imgWidth, imgHeight);
            leftHeight -= pageHeight;
            position -= 841.89;
            if (leftHeight > 0) {
              PDF.addPage();
            }
          }
        }
        PDF.save(`${title}.pdf`);
      });
    };
  }
};
